Tunable Luminescence of CeAl11O18 Based Phosphors by Replacement of (AlO)+ by (SiN)+ and Co-Doping with Eu
Tunable Luminescence of CeAl11O18 Based Phosphors by Replacement of (AlO)+ by (SiN)+ and Co-Doping with Eu
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DOI：
10.1149/2.0191407jss
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发表时间：
2014-01-01
影响因子：
2.2
通讯作者：
Hintzen, Hubertus T. (Bert)
中科院分区：
文献类型：
--
作者：
Yin, Liang-Jun;Chen, Guo-Zhang;Hintzen, Hubertus T. (Bert)
采用固相反应制备了一系列Si-N或Eu-Li掺杂的CeAl11O18和CeAl12O18N荧光粉。研究了它们的结构和发光特性。浓度小于8%的Si-N掺杂可以成功地溶解到CeAl11O18晶格中，并且不改变基体结构，只是由于Si-N键的键长比Al-O键短而导致晶格收缩。观察到随着Si-N掺杂量的增加，由于O-Me离子逐渐消失，蓝色发射逐渐减弱，紫外发射逐渐增强。与传统的UV发光荧光粉CeMgAl11O19相比，Si-N掺杂的CeAl11O18表现出更好的热稳定性。Eu-Li共掺杂CeAl11O18的晶体结构和晶格参数基本保持不变，这是由于稀土位点的容差较大。由于Ce3+的紫外辐射向Eu2+的能量转移，在Eu-Li共掺杂的CeAl11O18荧光粉中获得了高强度的单一重叠蓝色辐射。(C) 2014电化学学会。版权所有。
A series of Si-N or Eu-Li doped CeAl11O18 and CeAl12O18N phosphors are prepared by solid-state reaction. Their structure and luminescence are researched carefully. Si-N doping with the concentration less than 8% can be successfully dissolved into CeAl11O18 crystal lattice and doesn't change the matrix structure, only resulting in crystal lattice shrinkage due to the shorter bond length for Si-N bond versus Al-O bond. It is observed that blue emission gradually decreases and UV emission becomes stronger due to the gradual disappearance of O-Me ions with the increase of Si-N doping. Compared with the traditional UV emitting phosphor CeMgAl11O19, Si-N doped CeAl11O18 shows better thermal stability. The crystal structure and lattice parameters of Eu-Li codoped CeAl11O18 remain unchanged due to the large tolerance of rare-earth sites. On account of the energy transfer from UV emission of Ce3+ to Eu2+, a single overlapping blue emission with high intensity is obtained in Eu-Li codoped CeAl11O18 phosphor. (C) 2014 The Electrochemical Society. All rights reserved.